Gleis A, Lee SSB, Kotliar G, von Delft J. Dynamical Scaling and Planckian Dissipation Due to Heavy-Fermion Quantum Criticality.
PHYSICAL REVIEW LETTERS 2025;
134:106501. [PMID:
40153628 DOI:
10.1103/physrevlett.134.106501]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2024] [Accepted: 01/23/2025] [Indexed: 03/30/2025]
Abstract
We study dynamical scaling associated with a Kondo-breakdown quantum-critical point (KB QCP) of the periodic Anderson model, treated by two-site cellular dynamical mean-field theory (2CDMFT). In the quantum-critical region, the dynamical staggered-spin susceptibility exhibits ω/T scaling. We propose a scaling ansatz that describes this behavior and reveals Planckian dissipation for the longest-lived excitations. The current susceptibility follows the same scaling, leading to strange-metal behavior for the optical conductivity and resistivity. Importantly, this behavior is driven by strong short-ranged vertex contributions, not single-particle decay. This suggests that the KB QCP described by 2CDMFT is a novel intrinsic (i.e., disorder-free) strange-metal fixed point. Our results for the optical conductivity match experimental observations on YbRh_{2}Si_{2} and CeCoIn_{5}.
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